Reputation: 15161
I have a custom class named Optional< T >. This class overrides the implicit operator, something like this:
public static implicit operator Optional<T>(T value)
{
return new Optional<T>(value);
}
public static implicit operator T(Optional<T> value)
{
return value.value;
}
Ok, till now all fine, the direct operations like these work:
Optional<int> val = 33; //ok
int iVal = val; //ok
But, this doesn't work:
Optional<Optional<int>> val = 33; //error, cannot convert implicitly
So I'm wondering how can be supported the previous case.
Cheers.
Upvotes: 3
Views: 401
Reputation: 203812
You cannot chain user-defined implicit operators. If you define an implicit conversion from A to B, and from B to C, there is no implicit conversion from A to C that calls both. You'll either need to create a separate user-defined conversion from A to C, or have an explicit conversion to do half of the conversion for you.
Upvotes: 3